Harlem, district of New York City, U.S., occupying a large part of northern ManhattanIsland and Borough. Harlem as a neighbourhood has no fixed boundaries; it may generally be said to lie between 155th Street on the north, the East and Harlem rivers on the east, 96th Street (east of Central Park) and 110th Street and Cathedral Parkway (north and west of Central Park) on the south, and Amsterdam Avenue on the west.

In 1658 Peter Stuyvesant, Dutch governor of New Netherland, established the settlement of Nieuw Haarlem, named after Haarlem in the Netherlands. During the American Revolution, George Washington, retreating from Long Island, regrouped his forces and fought the delaying Battle of Harlem Heights (Sept. 16, 1776) just west of modern Harlem between 103rd and 120th streets. Through the 18th century , Harlem was a farming and pastoral area; in . In the 19th century , it became a fashionable residential district with many houses used as summer retreats. Apartment houses arose during the building boom of the 1880s. High rates of vacancy in the years following the panic of 1893 led property owners to rent to blacks, especially along Lenox Avenue, and by World War I much of Harlem was firmly established as a black residential and commercial area. The chief artery of black Harlem is 125th Street, popularly called “the Main Stem.”

After World War I , Harlem became the centre of the creative literary development called the “Harlem Renaissance.” Such figures as the poets Countee Cullen, James Weldon Johnson, Alain Locke, and Claude McKay were leaders of this new realism. An important anthology of writings of this movement is Alain L. Locke’s The New Negro (1925). As the neighbourhoods surrounding Harlem resisted expansion of its growing black population, residential overcrowding increased. At the same time, the aging dwellings there received only minimal maintenance—many were abandoned by their owners when the cost of rehabilitation and compliance with city housing codes became high. This still-continuing vicious circle, aggravated by high rates of unemployment and residential mobility, has caused severe deterioration of the neighbourhood. By the 1980s private community organizations and the city administration had taken measures to arrest these trends and their attendant social maladjustments. Public housing, new approaches in community-controlled schools, and better medical facilities were important developments.

The term Harlem is was often used inaccurately as a synonym for New York’s black community; in . In fact, by the 1970s the black population has had expanded beyond this area to other parts of Manhattan and to large parts of the Bronx and Brooklyn. Further, In the early 21st century blacks constituted some 40 percent of the population of Harlem, and the dual pressures of gentrification and new waves of immigration contributed to further decline in the proportion. New York City’s large Puerto Rican community has a population historically had its principal centre in eastern Harlem, along Park Avenue from 96th Street northward. This district, in an area known pejoratively as “Spanish Harlem,” shares the economic and social problems of black Harlem. From Lexington Avenue east to the East River, .” By 2010, however, the Hispanic community was concentrated in central Harlem, and east Harlem’s overall population numbers stood at roughly half of their 1950 peak. The late 2000s also saw an increase in the number of Harlem’s white non-Hispanic residents, a demographic shift by which whites constituted a larger percentage of Harlem’s population than they had at any time since 1940. One of the remnants of that early era of integration, “Italian Harlem,” persisted as a small enclave along First Avenue and Pleasant Avenue, with an axis along 116th Street, are the remains of “Italian Harlem.” There has been considerable friction between the ethnic groups making up Harlem’s population.